The atoms of one substance have a different atomic number fin the atoms of the other substance. are the substances the same element?

Astudent reads the following text in a science book: scientific evidence tells us that the cause of earths four seasons is the tilt of earth as it revolves around the sound the student is instructed to illustrate this information in a science book. how will the student illustrate winter in the northern hemisphere? a.earths northern hemisphere will tilt away from the sun. b. earths northern hemisphere will tilt toward the sun. c.earths orbit will be farther away than from the sun d. earths southern hemisphere will tilt away from the sun.

If a checkpoint detects damaged dna, the checkpoint may

The direct energy source that drives atp synthesis during respiratory oxidative phosphorylation is